Hot-air furnace



oct. 5 1926.

2 Sheets-Sheet lil vr.. z .n w 4 ,m a'v o m 7b. zc m .elf n ,n z. a JI.\I wf W a/f. n 9/Av Y -l .dv all Patented Oct. 5, 1926.

UNITED STATES PATENT OFFICE.

v WILLIAM C. LANG, OF EAST CLEVELAND, OHIO.

HOT-AIR FURNACE.

Application led November 18, 1925.

dome mounted on a lire-pot and also two ver-I tically spaced heat-radiating drums surrounding and spaced from said dome.

One object of this invention is to so construct and relatively arrange said dome and said drums that an exceedingly high efficiency in the utilization of the products of combustion vin the furnace is attainable.

Another obj ect is to so form, relatively arranged and connect together said drums and said dome that the lower drum is rigid with the dome, that said lower drum has an interior passageway extending circumferentially of the space between said drum andV the dome and placed in communication, at one end portion thereof, with the dome, and that the upper drum is arranged over and supported from the lower drum and has an finterior passageway extending circumferentially of the space between the upper drum and the dome and placed in communication,

at one end portion thereof, with the other end portion of the passageway in the lower drum and having an outlet arranged as required to render it capable of participating in conducting products of combustion to a chimney from the other end portion of the passageway in the upper drum.

Another object is to cause the products of combustion entering the interior passage` ways of said drums to pass with facility in one and the same direction in said passageways circumferentially of the combustiondome.

Another object is to render said dome and said drums, and the connection between the dome and the lower drum, simple and/durable in construction and highly practical.`

Another object is not only to attain lan iniproved circulation of the products of combustion in the furnace but to provide improved and highly practical means whereby products of combustion may be conducted laterally from the lower portion of the combustion-dome to the hereinbefore mentioned chimney without passing into the hereinbedrum. f

Another object is to form said dome and fore mentioned passageway in lthe upper the lower dome-surrounding drumof a sinserial No. 69,797.

let of said drum and the outlet of the dome,

V and toprovide said lower drum, at its outer side,with a laterally and outwardly projecting flue-forming tubular member arranged substantially in line with said outlet of the dome and Vconstituting a portion of a hereinafter described valved passageway adapted to be placed in communication with the hereinbefore mentioned chimney.

With these objects inview, and to attain other objects hereinafter appearing, this invention consists in certain meritorious features of construction, and combinationsand relative arrangements of parts, hereinafter described in this specification, pointed out in the claims, and illustrated in the accompanying drawings.

In said drawings, Figure 1 is a central vertical section of a portion of'a hot-airfurnaceembodying my invention. Fig. 2 is a section, in detail, taken along lin-e 2 2 in Fig. 1 and is drawn on a l-arger scale than Fig. 1. Fig. 3 is a central vertical section taken along line 3-3 in Fig. 1. Fig. 11 is ay horizontal section taken along line in Fig. 1. Fig. 5 is a vertical section, in detail, taken along line 5 5 in Fig. 4. Fig. 6 is a horizontal section, in detail, taken alond line 6-6 in Fig. 1. Fig; 7 is va Vertical section, in detail, taken along the curved line 7--7 in Fig. 4f.

Figs. 1, 3, 4 and 6 of said drawings show the upper portion of the fire-pot 10 of my improved furnace. Saidr furnace comprises a combustion-dome 12 mountedon the upper end of and communicating with the yfirepot'lO, andthe joint formed between said dome and the fire-pot-may be rendered fluidtightin any approved manner.

An air-chamber 13 is formed bustion-dome .12 and extends above said dome, and 15 indicates an upright cylindrical casingl forming a surrounding wall ofv said. chamber .and ext-ending above said dome. The chamber 13 has a top wall 16 which has upwardly projecting spaced flueforming tubular members 17 communicating with the constituting outlets vof said chamber. Air may -be supplied to the chamber 13 in any approved manner, and heated air asc-ending in said chamber is adapted to be conducted in any approved manner from the outlets 17of thevchamber to the rooms or space to be heated. Cbviously the casing-1.15

next eXternally o fand surrounds the fire-pot 10 and comtop wall 16 weuld net be used in a favnace installed on the loor of a room or space to be heated.

My improved furnace comprises an annular heat-radiating drum 18 arranged substantially concentricallyr in relation to the combustion-deine 12 and extending around the low-r portion ot and spaced from the dome. Said drum 18 has an interior passageway .19. extending circum'terentially of the space between the drum and the dome 12, and a iiue 2O communicates', at its innerv end, with the dome and constitutes a lateral outlet of said dome. Said flue 20 communicates, at its outer end,with' the passageway 19 and constitutesa lateral inlet of said passageway. The dome 12, drum 18, and flue 29 are preferably composed oit'y cast ironY and cast integral. rlfhe drum 18 has a substantially vertical interior transverse Vpartition 21 which, as shown in Figs. 1 land 6, is arranged at one sidev of the outer end of the lue 20, and said flue establishes direct. communication between the passageway 19 and the lower portion of theV dome-,12 only at one side of said partition. lt will be observed, theretore, that one end portion 'ot the passageway 19 is ar 'anged wholly at one side ot the partition 21 and communicates, at said side of said partition, with the flue 20, and said passageway extends from its inlet formed `by said tiue circumt'e'rentially et the dome 12 in the direction in which said side ot said partition faces, and the other end porti-on of said passageway is arranged wholly at the opposite side ot said partition. The drum 18 (see Figs. 3, 5 and 7) has a short upwardly projectingV tubular member 23 formed at the top ofthe last-mentioned end portion of and communicating with the passageway 19 and constituting a top outlet of said passageway. The drum 18 is providech at the outer side ot' said firstmentioned end portion of the passageway' 19, with a laterally and outwardly projecting 'tlue-torming tubular member 24 integral with said drum and preferably arranged opposite the outer end ot and substantially in line endwise with the flue 20. The tubular member 24 of the drum 18 is in communication with the passageway 19 and theretore with the dome12 and extends through the adjacent portion and externally ot' the casing 15 and may be userL as a substantially direct outlet ior products of combustion passing from said dome through the" l'lue 20 into said passageway 19. The drum 18 is provided, at the top thereof (see Figs. 8 and 4) Vwith upwardly projecting spa-ced lugs 25. and said drum (see F 1 and 2)V is provided, at yits outer side, with laterally and .outwardly projecting tubular members 28 which ila e toward their innerends and are integral with said drum and communicate with the passageway 19. .The tubular .members -26 entend through. the adjacent portion and externally of thecasing 15 and aitord convenient access to the passageway 19 for cleaning the walls of said passageway and are provided, at their outer ends, 'with clean-out doors 27.

rllhe upper drinn 28 extends around the upper portion of and is spaced from and substantially concentric in relation toV the' combustion-dome 1'2 and has interior passageway 29 which extends circumterentially ot the space between the dome and said upper drum'. @ne end portion of said passav'ewayv 29 (see Fig. 7) extends over the top outlet 23 ot the passageway 19 in the lower drum 18, and the upper drum 28 has an opening..

30 formed at the bottom of said end portion and constituting the inlet of. the passageway 29 in said upperdrum and registering andv communicating with said top outlet 28 of the passageway 19in the lower drum 18.

lAs already liereinbeiuore indicated, one side ot the interior partition 21 'of the lower drum 18 faces in the direction in which the passageway 19 in said drum extends circumi''erentially ot the space between said drum and the dome 12 `from the inlet of said-pa;- sageway, and l would here remarkl that the passageway 29 in the upper drum 28 (sce Figs. 4 and 7) extends circuin'ferentially of the space between said upper druml dome in said direction from over the outlet 23 ot the lower drum 18. The upper drum 28 (see Figs. 8 and 4) is provided, at the.

outer side 'ot the discharging end portion et the passageway 29, with a laterally and outwardly projecting flue-'forming tul ular member 81 which communicates with andand the constitutes a lateral outlet ot said passageo way 29 and extends substantially horizontally from said upper drum 28 through the adjacent portion and externally of the casing 15. The upper drum 28 (see-Figs'4 and 7) has a substantially vertical interior transverse partition 83 arranged between the inlet SO ot the passageway 29'and the ontl t member 81 ot said drum.

As shown in 5 andV 7,' the upper drum 28 has support on the outlet-member 28 of the lower drum 18,' 'and the 'joint formed between said drums said outletmember 28 may be rendered duid-tight in any approved manner. The upper drum 28 is seated on each lug 25 et the lower drum- A substantially horizontal pipe 8o (see figs. 8 Vand 4) is attached atene end to and communicates with the eutlet-niember-Sl oit the upper drum 28, and said pipe is provided, at its outer end, with a normally closed door 36 applied in any approved manner, and obviously when said door is opened access is had through said pipe and member 31 to the adjacent portion of the passageway y 29 in said drum for cleaning purposes. The pipe 35 is provided, at the top thereof betweenv the outer end of the pipe and the outer end of the outlet-member 31 of the upper drinn 28, with an upwardly projecting tubulai' member 37 at which said pipe may be placed in communication with a chimney in yany approved manner, and said pipe is provided, at its side which is nearer the tubular member 24 of the lower drum 18, with a laterally projecting member y38 which forms a lateral outlet of said pipe and embraces one end of a curved pipe 40 arranged externally and extending circumferentially of the casing tosaid member 38 of the pipe 35 from an elbow 41 which (see Figs. 1 and 4) establishes communication between the'pipe 40 and the vertical end portion of an elbow 42 extending and establishing communication between the upper elbow 41 and the tubular member 24 of the lower drum 18.

The lower elbow 42 is provided interiorly with a valve 43 preferably consisting of an upright plate which is arranged to be swung internally of said elbow andinounted at its lower end on and secured in any approved manner to a substantially horizontal shaft 44 supported from and extending externally of said elbow. rlhe valve 43 is shown in its closed position in Figs. 1 and 2, and the shaft 44is provided, externally of the elbow '42, with a crank 45 for rotating rthe'sliaft.

The valve 43 rests, when it is in its closed position, against a flange 46 formed on and internally of the elbow 42 and is obviously adapted to be actuated into an open posif tion by the required manipulation of the crank 45.

It will be observed that the tubular member 24 of the lower drum 18, the'pipe 40 and the elbows 41 and 42 are adapted'to be Y employed in forming a passageway arranged to substantially directly receive products of combustion discharged through the iue from the combustion-dome 12, and that the valve 43 controls communication through said passageway. It will also be observed that the products of combustion discharged by the flue 20 into the passageway 19 in the lower drinn 18, when the yvalve 43 is closed, passes endwise of said passageway 19- and'only circumferentially of the space between said drum and the dome 12 in` one direction to and through the top outletniember 23 of-said drum vinto thevpassageway 29 in the upper vdrum 28 and endwise of the last-mentioned passageway in said directioncircumferentially of the space Vbefs tween said upper drum and the dome to and through the lateral outlet-member 31 of said upper drum into the pipe from which products of combustion may be conducted, at the top-outlet 37 of said pipe, to a chimney in any approved manner.

The upper drum 28 (see Figs. 1 and 4) is shown provided, at its outer side, with Y laterally and outwardly projecting tubular members 48 which flare toward their inner ends and are integral with and spaced circumferentially of the drum and communicate with the passageway 29. The tubular members 48 extend through the adjacent portion and externally of the casing 15 and afford convenient access to and for cleaning the walls of the passageway 29 and are provided, at their outer ends, with clean-out ways 19 and 29 in one and the same direction eircum'ferentially of the dome 12, and

a remarkably high efficiency in the utilization of the products f combustion is attained. K

It will be observed that the combustiondome 12 is nou-partitioned so as to avoid a circuitous passage of products of combustion from the repot through said dome to the flue 20, and not unimportant for attaining maximum heating efficiency is the extension of said dome a considerable` distance above the lower dome-surrounding heating drum into which the flue 2O discharges so that there is always an adequate supply of hot gases'internally of the upper portion of said dome and above the path of the products of combustion from the firenot to said fiue dui-ino' the o eration" of' the furnace. Also, thebottom of the lower heating drum 18 is substantially flush with the bottom of the fine 20'to facilitate the vmanufacture of said flue and said drum and .between the VVupper and lower extremities of the dome, andthe lower drum 18 extends around'the lower portion `of the dome and has its top substantially flush with the top of said flue, soas to insure an edequate extension of said dome vabove said flue. Also, it will be observed that the short rupwardly projecting tubular member 23 of the lower drum 18 serves notoiily'asa top outlet for the passageway 19 ingsaid'drum Vbut 'also` l@atingwith and supported as a support for the upper drum 28, that the lugs 25 on the lower drinn and the feetforming members 34 of the upper drum serve in supporting the upper drum from the lower drum independently of the upwardly projecting tubular member 23 of the lower drum and also 'serve in adequately spacing said drums vertically, that the formation of the ripper drum and its feetforming` members B/l and tubular projecting members 3l and 48, of a single casting, and the formation of the dome l2, the flue 20, and the lower drum and its tubular projecting members 23, and 26 of a single casting facilities the assemblage of the component parts of the furnace, that the participation of the tubular member Q4 of the lower' drum in the formation of the hereinbefore described valved iassageway and the arrangement of said member 2li at the outer side or circumference of said drum and substantially in line endwise with the flue 2O facilitates the passage of products of combustion from sa l flue into said valved passageway when, in starting a lire, said passageway is employed in conducting products of combustion to the chimney, and that the relative arrangement of the heating drums and aforesaid valved passageway substantially wholly above the lower extremity of the dome l2 are of vast importance for convenience in the assemblage of the parts and for maintaining the parts in repairs and in a clean condition.

`What l claim is A. furnace comprising a lire-pot, a combustion-dome mounted on and communicating with the fire-pot, two vertically spaced heat-radiating drums extending circuinferentially of and spaced from said dome, the lower drum being supported from the dome and having an interior passageway which at one end portion thereof has a lateral inlet communicating with said dome and extends circumferentially of the space between the dome and said lower drum and also has a top outlet at its other end portion, and a valved controlledl passageway extending from the first-mentioned end portion of the first-mentioned passageway and adapted to be employed in conducting products of combustion from the furnace, the upper drum being` supported from the lower drum and having` an interior passageway which is in communication at the bottom of one end portion-thereof with the aforesaid top outlet of the first-mentioned passageway and extends circumferentially of the 'space between said upper' drum and the dome and has an outlet at its other' end portion for' conducting products of combustionV from the furnace.

2. A furnace comprising` a fire-pot, a combustion-dome arranged above and communi- M.fom thertuepot, a flue extending outwardly from and communicating and rigid with the dome, two vertically spaced heating drums extending around and spaced from the dome, an air'-V chamber formed next externally ofV the drums and lire-pot and having outlets for hot air, and a valved passageway placed in communication with the aforesaid flue and adapted to be placed in communication with a chimney, the lower drum being rigic'i with said flue and having an interior passageway which communicates at the outer end of and with said flue and extends froin si i d flue circumferentially of the dome to a point at which products of combustion are adapted to be discharged from said passageway and has a. top outlet at said point, the upper drum being supported from the lower drum and having an interior passageway which communicates with said outlet and extends from said outlet circumferentially of the dome to a point at which products of combustion are adapted to be conducted from said passageway to the aforesaid chimney, and all of the aforesaid passageways being arranged substantially wholly above the lower extremity of the dome,

3. il. furnace comprising a tire-pot, a combustion-dome arranged above and supported from and communicating with the fire-pot, a flue extending outwardly from and communicating and integral with the dome, two heating drums arranged the oneabove the other and cach extending around and spaced from the dome, an air-chamber formed next externally of the drums and lire-pot and having outlets for hot ain-and a valved passageway placed in communication Vith lthe aforesaid flue and adapted to be placed in communication with a chimney, the lower drum being integral with said flue and having an interior passageway which communicates at the outer endiof and with said flue and extends from saidV line circumf-erentially of the dome to a point at which products of combustion Vare adapted to be discharged'froin said passageway and has an outlet at said point, the upper -drui'n being supportedrfrom the lower drum and having an interior passageway which communicates with said outlet 'and extends from said outlet circumferentially of the dome to a point at which products of combustion are adapted to be con-ducted from 'said passageway, and the bottom of the lower VVdrum being sul stantially i'lush with the bot-tom of the aforesaid flue. Y

4. A furnace comprising` a. fire-pot, a. combustion-dome mounted on and communicating withthe lire-pot, a ilue extendingoutwardly from and communicating and` rigid with the dome, two vertically spaced helati'ng drums extending around and spaced. frein the l externally of the drums and lire-pot and having outletsfor hot air, and a valved passageway placed in communication vwith the aforesaid flue and adapted to be'pl'aced in communication with a chimney, the lower drum being riOid with said flu-e and having an interior passageway which communicates at the outer end of and with said flue and extends from said flue circumferentially of the dome to a point at which products of combustion are adapted to be discharged from'said passageway and has an outlet at said point, theupper drum being supported from the lower drum and having an interior passageway which communicates with said outlet and extends from said outlet circumferentially of the dome to a point at which products of combustion are adaptedto be conducted from said passageway, and the aforesaid flue being arrangerbetween the lower extremity of the dome and a point central between the upper and lower extremities of the dome.

5. A furnace comprising a fire-pot, a coinbustion-dome mounted on and communicating with the fire-pot, a flue extending outwardly from the lower portion of and communicating and rigid with the dome, two vertically spaced heating drums extending around and spaced from the dome, an airchamber formed next externally of the drums and ire-pot-and having outlets for hot air, the lower drum being rigid with sai-d flue and having an interior passageway which communicates at the outer end of and with said flue and extends from said flue circumferentially of the dome to a point at which pro-ducts of combustion are adapted to be discharged from said passageway and has an outlet at said point, and ,a valved passageway adapted to be placed in communication with a chimney, the upper drum being supported from the lower drum and having an interior passageway which communicates with the aforesaid outlet and extends from said outlet circumferentially of the dome to a point at which products of combustion are adapted to be .conducted from said passageway to said chimney, and the aforesaid valved passageway communicating at a point opposite the outlet end of the aforesaid flue, with the passageway in the lower drum and extending from said passageway in the lower drum to the exterior of the aforesaid chamber.

6. A furnace comprising a lire-pot, a combustion-dome mounted on and communicating with the fire-pot, a iue extending outwardly from and communicating and rigid with the dome, two vertically spaced heating drums extending around and spaced from the dome7 an air-chamber formed next externally of the drums and lire-pot and having outlets for hot air, the lower drum being rigid with said flue and having an rior passageway which communicates with l said outlet and extends from said outlet circumferentially of the dome to a point at which products of combustion are adapted to be conducted from said passageway to a chimney, and a valved passageway adapted to be employed in conducting products of combustion from the passageway in the lower drum to said chimney and partially forme-d by a tubular member which extends externally of the aforesaid chamberv from said drum and is integral with said drum and substantially in line endwise and in communication with the aforesaid flue..

7 A furnace comprising a lire-pot, a. combustion-dome mounted onand communicating with the fire-pot, a flue extending outwardly from and communicating and rigid with the dome, two vertically spaced heating drums extending around the dome, an air-chamber formed next externally of the drums and fire-pot and having outlets for hot air, and a valved passageway placed in communication with the aforesaid flue and adapted to be placed in communication with a chimney, the lower drum being rigid with said flue and having an interior passageway which communicates at the outer end of and with said flue and extends from said flue circumferentially of the dome to a point at which products of combustion areadapted to be discharged from said passageway, said lower drum being provided at said point with a short upwardly projecting tubular member which constitutes an outlet for the last-mentioned passageway and affords support to the upper drum, and the upper drum having support on the lower drum independently of said tubular projecting member and also having an interior passageway which communicates with said tubular projecting member and extends circumferentially of the dome from said projecting member to a point at which products of combustion are adapted to be conducted to the aforesaid chimney.

8. A furnace comprising a lire-pot, a combustion-dome mounted Von and communicating with the firepot, a flue extending outwardly from and communicating and rigid with the dome, two vertically spaced heating drums extending around the dome, an air-chamber formed next externally of the drums and lire-pot and having outlets for hot air, and a valved passageway placed in communication with the aforesaid flue and adapted to be placed in communication with llO a chimney, the lower drum being rigid with `saidfiue 'and having upwardly projecting spaced lugs and an interior passageway which communicates with said flue at the outer end of the fiue and extends from said flue circumferentially of the dome to a point at which products of combustion are adapted to be discharged from said passageway, said lower drum being provided at said point with an upwardly projecting tubular member constituting an outlet for said passageway, the upper drum being seated on the aforesaid lugs and having an interior passageway which communicates with sai-d tubular projecting member and extends Vcircumferentially of the dome from .said projecting member to a point at which products of combustion are adapted to be conducted to the aforesaid chimney, and said upper drum being provided, at one side of each of said lugs, with a foot-forming memberresting on the lower drum. l

9. A furnace comprising a fire-pot, a combustion-'dome mounted on and communicating with the fire-pot, a laterally extending iiue communicating` and rigid with the dome, two vertically spaced heating drums arranged substantially wholly above the lower extremity of and extending around and spaced from the dome, ran air-chamber formed next externally of the drums and fire-pot and having outlets for hot air, and a valved passageway ylargely arranged externally'of said chamber Aand adapted to be placed in communication with a chimney, the lower drum being rigid with the aforesaid flue and having an interior transverse partition and an interior passageway which extends circumferentially of the dome, one end portion of said passageway in the lower ydrum being arranged at one side of said partition and communicating with the aforesaid valved passageway and with the aforesaid Hue, the other end portion of the passageway in the lower drum being arranged at the opposite side of'said partition, said 1 eonsel lower drum being provided at the last-mentioned end portion of said passageway inthe lower drum with a tubular projection constituting an outlet for said passageway, and the upper drum being mounted on the lower drum and having an interior passageway which communicates with said -outlet and extends circumferentially of the dome from said outlet to a point at which products of combustion are adapted to be conducted to the aforesaid chimney.

l0. A furnace comprising a fire-pot, a combustioirdome mounted on and communieating with the fire-pot, a Iiiue extending laterally outwardly from the lower portion of and communicating and rigid with the dome, two vertically spaced heating drums extending circumferentiallyY of and spaced from the dome, an air-chamber formed next externally of the drums and fire-pot and having outlets for hot air, and a valved passageway placed in communication with the aforesaid flue and adapte-d tobe placed in communication with'a chimney, the lower drum being rigid with said fiue and having an interior passageway which communicates at the outer end of and with said iiue and extends from said flue circumferentially of the lower portion of the dome to a point at which products of combustion are adapted to be discharged from said passageway and has a top outlet at said point, theupper drum being supported from the lower drum and having an interior passageway which communicates at the bottom thereof with said outlet and extends from said outlet circumferentially of the dome to a point at which products of combustion are adapted to be conducted from said passageway, and the dome being non-partitioned and extending a considerable distance above the lower drum. i

In testimony whereof, I sign the foregoing specification.

WILLIAM o. LANG. 

